252 lines
7.7 KiB
C
252 lines
7.7 KiB
C
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/* ANSI and traditional C compatability macros
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Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* ANSI and traditional C compatibility macros
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ANSI C is assumed if __STDC__ is #defined.
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Macro ANSI C definition Traditional C definition
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----- ---- - ---------- ----------- - ----------
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PTR `void *' `char *'
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LONG_DOUBLE `long double' `double'
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VOLATILE `volatile' `'
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SIGNED `signed' `'
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PTRCONST `void *const' `char *'
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ANSI_PROTOTYPES 1 not defined
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CONST is also defined, but is obsolete. Just use const.
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obsolete -- DEFUN (name, arglist, args)
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Defines function NAME.
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ARGLIST lists the arguments, separated by commas and enclosed in
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parentheses. ARGLIST becomes the argument list in traditional C.
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ARGS list the arguments with their types. It becomes a prototype in
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ANSI C, and the type declarations in traditional C. Arguments should
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be separated with `AND'. For functions with a variable number of
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arguments, the last thing listed should be `DOTS'.
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obsolete -- DEFUN_VOID (name)
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Defines a function NAME, which takes no arguments.
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obsolete -- EXFUN (name, (prototype)) -- obsolete.
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Replaced by PARAMS. Do not use; will disappear someday soon.
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Was used in external function declarations.
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In ANSI C it is `NAME PROTOTYPE' (so PROTOTYPE should be enclosed in
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parentheses). In traditional C it is `NAME()'.
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For a function that takes no arguments, PROTOTYPE should be `(void)'.
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obsolete -- PROTO (type, name, (prototype) -- obsolete.
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This one has also been replaced by PARAMS. Do not use.
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PARAMS ((args))
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We could use the EXFUN macro to handle prototype declarations, but
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the name is misleading and the result is ugly. So we just define a
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simple macro to handle the parameter lists, as in:
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static int foo PARAMS ((int, char));
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This produces: `static int foo();' or `static int foo (int, char);'
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EXFUN would have done it like this:
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static int EXFUN (foo, (int, char));
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but the function is not external...and it's hard to visually parse
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the function name out of the mess. EXFUN should be considered
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obsolete; new code should be written to use PARAMS.
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DOTS is also obsolete.
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Examples:
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extern int printf PARAMS ((const char *format, ...));
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*/
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#ifndef _ANSIDECL_H
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#define _ANSIDECL_H 1
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/* Every source file includes this file,
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so they will all get the switch for lint. */
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/* LINTLIBRARY */
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#if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(_WIN32)
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/* All known AIX compilers implement these things (but don't always
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define __STDC__). The RISC/OS MIPS compiler defines these things
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in SVR4 mode, but does not define __STDC__. */
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#define PTR void *
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#define PTRCONST void *CONST
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#define LONG_DOUBLE long double
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#ifndef IN_GCC
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#define AND ,
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#define NOARGS void
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#define VOLATILE volatile
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#define SIGNED signed
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#endif /* ! IN_GCC */
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#define PARAMS(paramlist) paramlist
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#define ANSI_PROTOTYPES 1
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#define VPARAMS(ARGS) ARGS
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#define VA_START(va_list,var) va_start(va_list,var)
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/* These are obsolete. Do not use. */
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#ifndef IN_GCC
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#define CONST const
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#define DOTS , ...
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#define PROTO(type, name, arglist) type name arglist
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#define EXFUN(name, proto) name proto
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#define DEFUN(name, arglist, args) name(args)
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#define DEFUN_VOID(name) name(void)
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#endif /* ! IN_GCC */
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#else /* Not ANSI C. */
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#define PTR char *
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#define PTRCONST PTR
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#define LONG_DOUBLE double
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#ifndef IN_GCC
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#define AND ;
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#define NOARGS
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#define VOLATILE
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#define SIGNED
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#endif /* !IN_GCC */
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#ifndef const /* some systems define it in header files for non-ansi mode */
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#define const
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#endif
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#define PARAMS(paramlist) ()
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#define VPARAMS(ARGS) (va_alist) va_dcl
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#define VA_START(va_list,var) va_start(va_list)
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/* These are obsolete. Do not use. */
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#ifndef IN_GCC
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#define CONST
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#define DOTS
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#define PROTO(type, name, arglist) type name ()
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#define EXFUN(name, proto) name()
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#define DEFUN(name, arglist, args) name arglist args;
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#define DEFUN_VOID(name) name()
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#endif /* ! IN_GCC */
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#endif /* ANSI C. */
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/* Using MACRO(x,y) in cpp #if conditionals does not work with some
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older preprocessors. Thus we can't define something like this:
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#define HAVE_GCC_VERSION(MAJOR, MINOR) \
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(__GNUC__ > (MAJOR) || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ >= (MINOR)))
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and then test "#if HAVE_GCC_VERSION(2,7)".
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So instead we use the macro below and test it against specific values. */
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/* This macro simplifies testing whether we are using gcc, and if it
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is of a particular minimum version. (Both major & minor numbers are
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significant.) This macro will evaluate to 0 if we are not using
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gcc at all. */
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#ifndef GCC_VERSION
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#define GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__)
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#endif /* GCC_VERSION */
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/* Define macros for some gcc attributes. This permits us to use the
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macros freely, and know that they will come into play for the
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version of gcc in which they are supported. */
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#if (GCC_VERSION < 2007)
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# define __attribute__(x)
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#endif
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/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
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#ifndef ATTRIBUTE_MALLOC
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# if (GCC_VERSION >= 2096)
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# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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# else
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# define ATTRIBUTE_MALLOC
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# endif /* GNUC >= 2.96 */
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#endif /* ATTRIBUTE_MALLOC */
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/* Attributes on labels were valid as of gcc 2.93. */
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#ifndef ATTRIBUTE_UNUSED_LABEL
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# if (GCC_VERSION >= 2093)
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# define ATTRIBUTE_UNUSED_LABEL ATTRIBUTE_UNUSED
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# else
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# define ATTRIBUTE_UNUSED_LABEL
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# endif /* GNUC >= 2.93 */
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#endif /* ATTRIBUTE_UNUSED_LABEL */
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#ifndef ATTRIBUTE_UNUSED
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#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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#endif /* ATTRIBUTE_UNUSED */
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#ifndef ATTRIBUTE_NORETURN
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#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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#endif /* ATTRIBUTE_NORETURN */
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#ifndef ATTRIBUTE_PRINTF
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#define ATTRIBUTE_PRINTF(m, n) __attribute__ ((__format__ (__printf__, m, n)))
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#define ATTRIBUTE_PRINTF_1 ATTRIBUTE_PRINTF(1, 2)
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#define ATTRIBUTE_PRINTF_2 ATTRIBUTE_PRINTF(2, 3)
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#define ATTRIBUTE_PRINTF_3 ATTRIBUTE_PRINTF(3, 4)
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#define ATTRIBUTE_PRINTF_4 ATTRIBUTE_PRINTF(4, 5)
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#define ATTRIBUTE_PRINTF_5 ATTRIBUTE_PRINTF(5, 6)
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#endif /* ATTRIBUTE_PRINTF */
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/* We use __extension__ in some places to suppress -pedantic warnings
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about GCC extensions. This feature didn't work properly before
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gcc 2.8. */
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#if GCC_VERSION < 2008
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#define __extension__
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#endif
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/* Bootstrap support: Autoconf will possibly define the `inline' or
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`const' keywords as macros, however this is only valid for the
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stage1 compiler. If we detect a modern version of gcc,
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unconditionally reset the values. This makes sure the right thing
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happens in stage2 and later. We need to do this very early;
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i.e. before any header files that might use these keywords.
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Otherwise conflicts might occur. */
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#if (GCC_VERSION >= 2007)
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# ifdef __STDC__
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# undef const
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# endif
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# undef inline
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# define inline __inline__ /* __inline__ prevents -pedantic warnings */
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# ifndef HAVE_LONG_DOUBLE
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# define HAVE_LONG_DOUBLE 1
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# endif
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#endif /* GCC >= 2.7 */
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#endif /* ansidecl.h */
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